body{
    background-attachment: fixed;
}

/*一个设置模糊背景的方法*/
#bg{
    z-index: -1;
    -webkit-filter:blur(5px);
    filter: blur(px);
    width: 100%;
    height: 100%;
    position:absolute;
    left: 0;
    top: 0;
    background-repeat: no-repeat;
}

.main .function-bar{
    height: 30px;
    width: 100%;
}

.main .function-bar .function-img{
    width: 30px;
    height: 30px;
    position: absolute;
}

.main .lesson-div-out .lesson-frame{
    height: 800px;
    width: 100%;
    border: 0;
    border-radius: 15px;
    background-color: rgba(255,255,255,0.1);
    padding:5px;
}

/*设置界面*/
/*添加课程*/
#setting,
#add{
    height: 800px;
    width: 100%;
    background-color: rgba(0,0,0,0.25);
    border-radius: 15px;
    padding:5px;
    text-align: center;
}

#setting .title,
#add .title{
    margin: 5px auto;
    color: white;
    font-weight: bolder;
}

#setting .setting-frame,
#add .add-frame{
    height: 720px;
    width: 100%;
    border: 0;
    padding:5px;
}

.foot{
    background-color: rgba(255,255,255,0.75);
}